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This is clearly a follow up to the marketing push to developers that began at WWDC. An unsurprising addition given the fact that there's really no solution to the iOS 7 UI revamp without making Apps iOS 7 only.

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It was my impression from the sessions that applications which use mostly system UI can be done in a way that works (and looks nice) on both OSes by relying on AutoLayout. And if you made a completely custom UI, it'll look as foreign to iOS7 as it looks to iOS6 now.

The trouble is the people in the middle. They used system UI where possible, but then rolled their own where Apple didn't have a good solution. If you recompile those apps against iOS 7 SDK, your app looks like junk, and it's a lot of work to fix it. If it's not a super-profitable app, are you really going to go back and get new art done, or are you just going to keep it the same, by using old XCode or something.

The other trouble is that a lot of devs don't use AutoLayout, because it's historically been very hard to get working right. And transitioning your app to it hasn't had many benefits in the past.

CityMapper have recently launched a new UI which is very ios7. Looks great on ios6

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